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Dear Mr. Brehaut,
Thank you for posting your request on History Hub!
CPC may mean Civil Protection Committee. For the information about civil defense, we suggest you contact the Library and Archives of Canada, 395 Wellington Street, Ottawa, ON K1A 0N4, Canada. We also suggest contacting Civil Protection Planning in Quebec.
We hope this is helpful. Best of luck with your family research!
Thank you very much, that seems to fit with what I know here.